Barcelona, AMD's first quad-core processor for servers, is shipping to some customers in the high-performance computing market. But the company had hoped to start shipping it to a wider variety of customers this month, as well as introduce a faster model that could better compete with Intel's latest Penryn chips.
Unfortunately for AMD, that's going to have to wait, according to a company spokesman. The Tech Report has an excellent description of the problem that AMD encountered with the translation lookaside buffer used in cache memory, which also affects the Phenom desktop chips.
On a day when most of the stock market was up, AMD's stock dropped 3.68% on this news.